Patent GB-773816-A (GB)
Title: Apparatus for treating synthetic threads to produce bulked stretch yarns
IPC: D02G1/02
Filed: 1954-12-09
Abstract: 773,816. Spinning, twisting, and finishing yams. ZWIRNEREI & NAEHFADENFABRIK GOEGGINGEN AKT.-GES. Dec. 9, 1954 [Dec. 17, 1953; Feb. 15, 1954; July 28, 1954; Aug. 27, 1954; Oct. 19, 1954], No. 35652/54. Classes 120 (2) and 120 (3). Apparatus for crimping synthetic yarns or threads to produce bulked stretch yarn comprises a container for wetting or swelling agent, a false-twisting device and means for setting deformations produced in one or more threads thereby comprised in a treatment zone, and compensating means for enabling the distance the thread travels in passing through the container to said zone to vary to compensate for variations in tension in the thread and to loosen the structure in its crimped condition. The yarns may be temporarily or permanently combined, as by intertwisting with yarns similarly crimped or about to be crimped or with untreated i.e. smooth, yarns at any stage to produce different crimp effects in a single or composite yarn, Figs. 5-7 (not shown). In the operation of the apparatus shown in Fig. 1 threads 13 are wound from bobbins under the tension of a pair of rollers 14, 14', which may be heated, and are combined by rotation of a table 15 to form a yarn which is passed through a container 5 wherein wetting or swelling liquid, which may contain a dyeing liquor, is applied, thence over a roller 10, around guide rollers 9, through a drying chamber 6 constituting a setting device, through a false-twisting device 8, and crimped yarn 13' is fed by a roller pair 16, 16', to bobbin(s) at 2 or a cop 3 whereby the constituent crimped threads are separately wound (an alternative path for a single thread is shown chain-dotted) : the roller 10 is connected by a tension-balancing spring 12 to a guide carriage 17 sliding in a track 11 to form the compensating means. In the region 7, the deformations imparted to the liquid-treated threads by false-twist running back to the rollers 14, 14' are permanently set and remain in the thread although the advancing twist is forcibly removed as the thread passes between the rollers 16, 16'. In order that thread leaving the falsetwister is subjected to minimum stress and loss of crimped effect thereby prevented, the thread is passed in the form of a depending loop which may be maintained by a weight freely suspended therein, Figs. 2 and 3 (hot shown). Two or more successive false-twisting devices each associated with a drying chamber 6 may be used. The false-twisting device of Fig. 4 comprises a twist tube 25 carrying a sleeve 24 on which is mounted a pinion 23 meshing with a crown wheel 22 driving a yarn-guiding roller 21. As shown in Fig. 19, yarn 13 passes through, and is driven by a gas jet applied by a nozzle 60 around, a channel 59 formed between an annulus 57 and a core 58 : in a development, Fig. 20, the yarn 13 is threaded through a light slipper 76 which is driven and rotated in a cylinder 62 i.e. around a channel 74, by an air jet from a nozzle 75. In alternative constructions the device may comprise a rotor 78 bored to receive the yarn and positively driven pneumatically as in Fig. 21 : in the apparatus shown in Fig. 22, a gas jet enters through an inlet nozzle 80, impinges on blades of, and thereby rotates, a rotor 81 carrying the yarn 13 in an eccentric notch in the bore 66 thereof, and discharges through a pipe 82 : in the construction of Fig. 23 the thread passes through a curved bore 84 in a rotor 85 which is rotated by air supplied through nozzles, as at 86, and discharging centrally of the rotor, partly into a pipe 87. In another apparatus, Fig. 24, the thread passes from a chamber 94 into a pipe 95 wherein it is subjected to vapour, heat, or like setting agents, then through a false-twister : compressed air or vapour 96 is fed via valvecontrolled nozzles, as at 97, passes through pockets 100 in a stationary ring 99 and impinges on pockets 102 in, and rotates, a rotor 101, finally discharging through ports 103 : an egg-shaped guide member 110 located in a bore 111 is formed with a curved bore through which the yarn passes, or, as shown in Fig. 26, the member may be a ball 112 which automatically maintains the thread 13 in one of semi-circular recesses, as at 116, in the wall of a rotor 114 leading to a central bore 113. A spinner 117, comprising a zig-zag bore 118 leading to a straight bore 119, of the twisting device shown in Figs. 28 and 29 is driven by oil friction by rollers 120, 121, 122, which are rotated by a driven belt running over driving discs 125, within a casing 123 partly filled with oil 124. The drying chamber shown in Fig. 9 comprises a heating element 32 having a slot 33 closed by an end wall 34 and along the central longitudinal axis of which the thread 13 travels under the guidance of eyes, as at 35, carried on stirrups, as at 36, which may be attached to or independent of the wall 34, Fig. 12 (not shown) : the wall 34 is hinged, as at 37, or pivotally mounted to swing about a detached bearing-rod. An alternative construction, Fig. 10, comprises heating coils 39 arranged between metal formers 38 and 40 insulated by an asbestos slab : a hinged asbestos (46)- fronted lid and the body of the chamber contained in housings 43 and 48 are filled with insulating material such as glass- or rock-wool. In the construction shown in Fig. 11, a ceramic carrier 51 comprises four vertical channels accommodating heating coils 39 and ribs 52 forming insulating chambers which may be evacuated. In another modification, Figs. 17 and 18 (not shown), the wall 34 may constitute a downwardly displaceable flap which, in its open position, facilitates insertion of the thread. The drying chambers may comprise means for subjecting the thread to an air current and/or means, such as internal swing- ing elements, which oscillate the thread passing therethrough.